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Finding the Fourth Proportional to 28,203.54, 42,313.62 and 8,485.11

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Solution

The fourth proportional to 28,203.54, 42,313.62 and 8,485.11 is: 12,730.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,203.54 : 42,313.62 = 8,485.11 : x
  2. Step 2: Convert to fraction form
    28,203.54/42,313.62 = 8,485.11/x
  3. Step 3: Cross multiply
    28,203.54x = 42,313.62 × 8,485.11
  4. Step 4: Simplify right side
    28,203.54x = 359,035,720.20
  5. Step 5: Solve for x
    x = 359,035,720.20/28,203.54
  6. Step 6: Final answer
    x = 12,730.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.